Grease trap and cover for same



` Feb. ll, 1930. c. H. CUMMINGS 1,746,992

GREASE TRAPAND COVER FOR SAME Filed Jap. 2, 1929 Patented Feb. 11, 1930 UNITED STATES CHARLES H. CUMMINGIS, OF DENVER, COLORADO GREASE TRAJ? AND COVER FOR SAME Application filed January 2, 1929.

This invention relates to improvements in the construction of grease traps and covers for the same.

In present sanitary engineering practice it 5 is common to construct grease traps of concrete. These grease traps are made from a plurality of rings that are constructed with interengaging surfaces so that one ring can be supported by another and in this manner lo a grease trap of any depth can be formed quickly. Such grease traps have been provided with removable covers which have been formed, either from a, concrete slab or from a piece of cast iron laid on top of the trap so as to close the upper end thereof. This method of closing grease traps has several objectionable feature's which, however, Awill not be pointed out in this specilication.

It is the object of this invention to produce a cover that can be readily applied and removed, and which will positively seal the upper end of the trap so as to prevent the escape of sewer gases. Another object of this invention is to so construct the grease trap itself that the inlet and outlet pipes can be readily attached to it with calked joints so as to provide a tight and worlrmanlike construction.

The above and other objects which will become apparent as the description proceeds, are obtained by means of a construction and an arrangement of parts \vhiclrwill now be described in detail, reference for this purpose being had to the accompanying drawing in which'the preferred embodiment of the invention has been illustrated, and in which:

Fig. l is a top plan view of the cover and attaching ring employed in connection with my improved trap, a portion of the cover having been broken away to better illustrate the construction;

Fig. 2 is a vertical section taken on line 2 2, Fig. l, and shows the manner in which the inlet and outlet pipes are attached to the body of the trap;

Fig. 3 is a section taken on line 3 3, Fig. l, and shows the manner in which the cover is secured to the cover frame at the top of the 50 trap;

Serial No. 329,908.

v Fig. 4 is an end view of oneof the thimbles employed in the construction; Fig. 5 is a vertical-section through a=modi fied construction; and

Fig. 6 is a section taken on line G-6, Fig. 5. The grease trap illustrated in Figs. A1 and 2 comprises a bottom ring l' which -is formed integral with the bottom 2. The upper edge' of the ring portion has an inclined annularA surface 3 terminating at the top and bottom in transverse surfaces 4. The ring 5 that is supported on the ring l has cooperating surfaces so that it can be placed directly onto the lower ring and will be securely held by the same in centered position. -Before the rings are assembled, surfaces 3 and 4 are covered with a thin cement wash -so as to form a seal and for the purpose of binding the parts to-I gether. In the construction illustrated, there are two rings 5 4and atop ring Gall of which are supported on thel bottom ring l. Q The two central rings 5 are identical in shapefand size, whereas both the bottom ring land the top ring 6 are of a specificallyditerent con-v struction. When the lower'riiig 1 is molded, a thimble 7 ismolded 4into the 'sideof the ring in the manner shown in' Fig.' 2. 4This thimblehas a cylindrical openingsomewhat larger in diameter than the outer opening of the soil pipe 8 that is'to be attached 'to it. `It is also provided with an inwardly extending flange 9 that forms a stop for'the'iiner end; of the soil pipe. In order-to' properly locate' this thimble it is provided with 'a plurality of projections l0 tha't'extend radially from the outer surface thereof, and which serve t'o'hold the thimble securelyin place. 'After the' pipe 8 has been introduced into the thimble, `the space between the pipe and the-inner surface of the thimble is calked with some' suitable material 11, such as oakum and lead. A similar thimble is secured to the w'a'll of the upper ring 6 in thesame manner as described but this thimble is of such size that the inlet pipe- 12 can pass in to the interiorofthe trap andv is held centrally of the thimble by the action of the flange 9. After this pipe hasbee'nintroduced, the space betw'en'it and thefinne'r' surface of the thimble is' calkedir'i the same manner as previously described? When ringv 6 is molded, it is molded onto a ring 13. This ring has a cross section which, for the greater part of its length, is like that indicated in Fig. 2 and is provided with a circular recess 1d that forms an annular horizontal surface, which terminates in a downwardly and in- Werdly vepideiidi-iig fleiige le.A The .out-er ser: ieee oi ,f .le'iige ip pirovidedgiyitli e. .beed'le that forms an interlock With the material of the ring. .The annular surface 14 is provided with a semi-circular groove #17 that is adapted to receive a round oraldruin rope which serves as a sea-ling medium; 0f course any other suitable material `.can be used for this purpose but it is preferred toe'mploy a maier-iel. plies Awill lest' lieder tlie-eoiiditioiis io 'liioli it is sobieebede lli eiigiilerly speoed pesitioiis, die deiige'lfl provided Willi. reotangular depressions 18,1 vvhose bottoms are A. provided Wiili-itlireeded opeiiiiigs 1Q- The ooYer '2 0 is .-sligliily pp-Werdly .soirees epd is proi'ided'witli e flee simpler deiige 21. ii'liieli. rests iipoii the iloiige. 1.4.-. .This delige is. also provided liyitli en erogate. iliai. is

edepied to reeeive die seeding :iiiediiipi 11.7

iii. die iiieeiier iridioeied in :F.ig- 3. V.Belts 2,3 poss. tlirop-gli, opepiiig-s loeeted in. depressed areas 24: Yend these bolts .edepted to. -eiigege-ille threaded-openings .19in die iii-eriiier iiidieeted- Fig- 3: Wilieri elle sieger-:is vprie into pleee grid elereped -ageiiist elle sealing materiel. 17' by die eotioii. oi the boltsi, elle. ooyer- Will forel. e. ges tig-lip epd oeil be reedilyremoved' reeioiiiiig tlieizbolis eed o' i-beii prying theA eoveriipfrorri iisseet Iii order to feeiliteie die removal. di tlreiooyeiw the ring 13 is provided with. e polzeli '-1215 the@ ieeiliteies ehe introduction of. e pinoli bei'I or a `chisel by means -of which the coverca-n be reised- Forilie purpose divl-.ieiidliiig ille-oever it hasbeen provided with a central spherical depression 26. aerossiyvliic-h a bar @Tiroir-tends. This bar is .leest into. elle' materiel .and .ser-ves as e handle the@ een be erigeged ivlieii tbe eoyeris removed eed per iii-po pleoe The .outlet `pipe of iyliioll vdie |1- 8 forois e part-.eoiiipr-isesfiii eddibioere il' @dieet-bose upper end e oleerioui section .2.9. is etieelied The upper end of this oleeiioob seeeioii. een.

Ibeelosed by .e plug-.ddee .in eey other-seiieblelweyi. "The pipe 3l which -ooppeeted forth@ side openipgo-f-the. T estende-.io .the sever eed-iis position in. e yeibieel direc-l tion determines elle levelei; the. .bereide-ith.-

' in Athe trap.

:la Figs.. 1.5.. end G .I4 here shove emoldiiied eopstriietiop iirwliieli tbelooetoip ereg-l lies been modifi .d-by die omissieiiof.- plieilihiiiible 'z and the substitution .of imverdily eiriepding ehioleeiied portion 132 iyli1oli lies e oyliiidrieal opeeii-.ig 'The .epigilooser-ed direeely dboverirrg -.1 lies .e eoeresporidi-.iig ffliielreded portion; epd e. eorrespopdiiigoyliiidrioel -opeiiiiige both .or .wliiole eeirbeireede le register with. .ipe .eoerespoadieg-:peet iii the lower ring. This ring also contains the thimble 7 to Which the overflow pipe 31 is connected. The upper ring 6 is constructed in the same manner as the one shown in Fig. 2. In this modified construct-ion, the inter engaging surfaces corresponding to surfaces 3 eed e. are of slightly different forni. In this imodified. oonslriiobioii, the iipperedge of each ring is provided With a V-shaped groove andthe lower edges a V-shaped projection 35. In assembling the parts a thin cement mixture is p laced in the groove 34, and

When the next'ring is put into place, this cement mixture will he squeezed out between the adjacent surfaces so as to form a tight seel- When the openings ere. to be. ,eleened tliey is removed end e. properly .eolistructed swab is introduced into the cylindrieel opening .33-

From .the above A( lescription it- Will be ap: pereiit vliet .1. lieve. produoed e g-reese trop eoiistroeiioii to which elle supply eed` oyeriiow pipes .een be readily .eiieolied end which is provided with. e reiiioyeble Cesi iron oever iglieb eiteolied to. the grease irep. by -pieeris ilioli permits-.the ooyeriio be .reedily eiteelied and removed' epd in Wliieli. the ooyer also` fori-iis Might .seeli Hering .deseribed the invention. iyfliet is Claimed es, new is.:

.A .oever for eeiiierii greese trops iooiiipxising e ringlievirigl e. oyliridrieel flange. ind an eiiriiiler delige extending oii-bwerdly from. one errd -oif ille cylindrical fleiigei seid annuler flange lieving itssurfeoe for-pied bytwo ooi-i.-y

area having also` a circular depression adaptieetions edepeed toy Ifit iiiio ilse recesses. iii-.ille l ring, seid projections lievi-.iig holes. wliieliregister with -ilie holes in die. .recesses eed demping bolts vin seid holes: i

In testimony whereof I aflx my signature.

@Hire-Lies Cummings.. 

